Brake



May 28, 1940. G. A. GoEPFRlcH 2,201,999

. BRAKE Filed Dec. 29. 1957 VLCLalrh Engaged U CLuLch Diengaged.

ATTORNEY:

Patented May 28, 1940 UNl'rle'zDg STATES PATENT ori-ICE BRAKE Application December 29, 1937, Serial No. 182,187

g claims. (ol. 19a-1a) This invention relates to brakes and more particularly to brake control mechanisms.

An object of the invention is to provide a brake control mechanism. 'wherebyvthe brake may be 5 held in the applied position by a secondary brake controlling means apart from` the brake pedal, thus allowing the driver to use the foot normally used to apply the brake for any other desired purpose. This arrangement is sometimes called a l hill holder being especially useful on a hill.

A further object of the invention is to provide a secondary brake control separate from, but to be releasedin synchronism with the engagement of the clutch, the same :footl controlling both, the l operation of the secondary brake controlling means being optional. Y

A further object of the invention is to provide a secondary brake control whereby the brake may be further applied without releasing the applying means of the secondary brake controlling'means.

A feature of the invention is a novel uid cylinder, preferably hydraulic as illustrated, allowing the brake to be locked at any one of an innite number of positions.

The above-and further objects and features will be evident from the following description and claims.

I have illustrated my invention by a drawing, of which:

Figure 1 is a diagrammatic view of the brake applying means together with the secondary brake controlling means;

Figure 2 is an enlarged view in vertical section of the secondary brake controlling means; and

Figure 3 is a diagrammatic sectional view showing the relation of clutch operation to the operation of the brake lock.

In Figure l is illustrated a hookup embodying the invention, comprising a brake pedal I which actuates a hydraulic master brake cylinder 3,

which in turn forces hydraulic brake iluid through an outlet 4 to actuate brakes 1. Adjacent to a clutch pedal Zand in such a position so'as to be easily accessible to the foot operating the clutch pedal 2 is a push button 5 arranged to opthrough-a cable I1. I The structure of the secondary brake control is more clearly shown in Figure 2 and consists of the button Swith a stem c onned in a'guide 9 held in place in the floor board by the clamp nut I0. The button 5 is provided with an v inside thread at end II so as to receive a cable end I2 which is held xed in the shank of button 5 by a check nut I3. A spring I6 holds the button erate a secondary brake control cylinder 6` 5 in released position. The cable end I2 is secured to one end of a cable I1.` Y

The cable I1 is attached by means of a cable end I8 to a valve stem I9 which is held xed relative to the cable end I8 by the check nut 20. A 5 spring 2l rests at one end against a shoulder formed on the valve stem I9 and at the other end on a `cap 23 screwed into a housing 21 formed on the cylinder body 24. 0n one end of the valve stem. -I9 there is vulcanized a rubber seal 25 to 10 chamber 21a by an inlet port 28. In the fluid 15 cylinder 3I are the spring 32, the rubber piston cup 34the piston 35,and the secondary piston Y Y packing 36 provided to prevent air from entering Y the cylinder 3l.

The entire unit is attached to the brake pedal 20 I by a rod 31 fastened at one end to the pistonV 35 by a ball joint 38 and at the other end to the brake pedal I by a yoke 39 and pin 40. To regulate the fluid ow from the reservoir 26 to the cylinder 3|, when the port 30 is closed, isa check 25 valve 43 consisting of a spring 44 and a ball 45. The ball closes a port 46 in a plug 41 allowing the uid to ow in one direction only, that is from the reservoir -26 to the cylinder 3l.

The cylinder 3l is-kept free from dirt by a boot 30 4I secured, at one'end, in a recess 42 on the housing 24 and at the other end to the rod 31. The

.reservoir 26 is provided with a cover plate 48 secured by means of screws 43. The reservoir 26 is further provided with an air vent 50 in the 35 plate 48' which may or may not be provided with an. air cleaner. Inroperation 'when the brake is applied by means of the brake pedal I and thereafter the button 5 is depressed together with the clutch 40' pedal, the spring I6 is compressed and the tension thereof removed from the cable I1. Thereupon the spring 2I moves the valve stem I9 downward closing the port 3U, trapping the iluid in the cylinder 3l and consequently keeping the brake ap- 45 plied as long as the pedal 5 -is depressed. 'I'he brake may be further applied if desired. Further application draws uid into the cylinder 3'I through the check valve 43. The brake is held z pplied until the pressure on pedal 5 is released, 50

v hereby the pressure of the spring I6 acts through the shaft I4 and cable I1 and moves the rubber seal 25 from the valve seat 29, allowing the uid to flow through the ports 36 and 28 into the reser- Ivoir 26, thus auowingithe brake to be reieased. 55

It is to be understood that the detail description above is for illustration only and is not intended to limit the scope of the invention.

I claim:

1. In a brake control mechanism, a primary brake controlling means and a. secondary brake controlling means for holding the primary brake controlling means applied, said secondary means comprising a fluid control having a cylinder, a piston in said cy1inder,'a reservoir connected to said cylinder, a valve for shutting oi'fiowbetween said reservoir and said cylinder, a spring for moving said valve to open position, a foot pedal, means controlled by said pedal for closing said valve against'. said spring, and a check valve that allows fluid to flow from said reservoir to said cylinder. i

2. In a brake control mechanism, a primary controlling means and a secondary brake controlling means for holding the primary brake control means applied, said secondary means comprising a fluid control having a cylinder, a piston in said cylinder, a reservoir connected to said cylinder, a valve for shutting olf flow between sald reservoir and said cylinder, a. spring for moving said valve to open position, a foot pedal, means controlled by said pedal for closing said valve against said spring, and a check valve that allows fluid to flow from said reservoir to said cylinder, said secondary brake pedal being so arranged relative to the clutch pedal that both said clutch pedal andsaid secondary control pedal may be depressed or released together synchronizing the engagement of said clutch with the release of the brakes, the operation of said secondary brake control p edal however being optional.

GEORGE A. GOEPFRICH. 

